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It appears that there continues to be some misunderstanding regarding Covid-19 vaccination. The two vaccines currently available in the US are very effective in reducing symptomatic infection, but symptomatic infection still occurs. The vaccines are very, very, effective in reducing severe disease. Asymptomatic infection after vaccination certainly occurs, but was not specifically investigated in the Pfizer or Moderna clinical trials. Vaccinated individuals with symptomatic or asymptomatic infection are likely able to transmit virus, the risk may be different than in unvaccinated individuals.
So, vaccinated individuals are still at some risk for infection, from unvaccinated or vaccinated people, and are still able to potentially transmit virus to others. Therefore, it is prudent to continue to follow masking, social distancing, handwashing and avoidance of risk gatherings to complement the ever growing number of individuals who have been vaccinated.
Diagnostic testing in vaccinated individuals is still done, as in travel regulations, to identify people with asymptomatic or minimally symptomatic infection. A PCR test has better sensitivity over an antigen test.
So, vaccinated individuals are still at some risk for infection, from unvaccinated or vaccinated people, and are still able to potentially transmit virus to others. Therefore, it is prudent to continue to follow masking, social distancing, handwashing and avoidance of risk gatherings to complement the ever growing number of individuals who have been vaccinated.
Diagnostic testing in vaccinated individuals is still done, as in travel regulations, to identify people with asymptomatic or minimally symptomatic infection. A PCR test has better sensitivity over an antigen test.